UPDATE
I just got done applying the Gummi Pflege Stift on my E90. It took about 30 minutes to cover all four door frames, the four openings on the body of the car, trunk and inside the engine bay (one long weather strip below the wipers). I think I used about 1/4 of the 3.4 oz bottle. So I should be good for another 3 applications. I purchased it from Amazon for only $8.
The solution itself is a liquid and comes out as a liquid. As you can see, there is a sponge top applicator. So no need to transfer the solution to a micro fiber towel and it's not a messy spray. The sponge was initially WHITE. After I got done, well, you can see my weather strips were pretty dirty and turned the sponge GRAY. The solution has a pleasant citrus smell to it.
I need to let the solution dry and I'll report back tomorrow with my impressions. Even though I had the dealer install 3M tape on my door frame, I still had a slight rattling noise (not squeaky). I hope the Gummi Pflege fixes the problem.
